Reporting Facility Commands › FILE Command › VSAM File Definition › RRDS Organization

RRDS Organization

Retrieval of records from VSAM files organized as RRDS can be sequential, skip sequential, or direct, using a full key argument only. Specification of a generic key is not permitted.

When using the skip sequential or direct retrieval methods, you must define the key as the first four bytes of the record I/O area. Other than the above restrictions, the rules of KSDS retrieval also apply to RRDS retrieval. Code the 'defineparameters' necessary for relative record processing of a VSAM file as follows:

►►─ 'RROD,KEY, ─┬───────┬─ ' ─────────────────────────────────────────────────►◄
                ├─ SEQ ─┤
                ├─ SKP ─┤
                └─ DIR ─┘

The following Reporting Facility program illustrates the techniques necessary for RRDS VSAM sequential file access:

        USER 'XYZ COMPANY, INC.'
 MASTER: FILE VSAM   'RRDS,KEY,SEQ'    RECORD=29
        DEF  RELATIVE-KEY-VALUE                        1-4 B
        DEF  DIVISION                                  5-6 X
        DEF  DEPARTMENT                                7-9 X
        DEF  EMPLOYEE-NUMBER                         10-13 N   'EMPNO'
        DEF  EMPLOYEE-NAME                           14-29 X
        REPORT 'RRDS SAMPLE 1'
        SELECT ALL
        CONTROL EMPLOYEE-NUMBER
        PRINT   DIVISION DEPARTMENT EMPLOYEE-NUMBER EMPLOYEE-NAME
        END